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UNIT 22 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX
22-1) What is the difference between pipe and tubing?
22-2) What materials are used for piping and tubing in heating, air conditioning, and
refrigeration systems?
22-3) What materials are used for refrigerant piping?
22-4) What materials are used for fuel gas piping?
22-5) What materials are used for water piping?
22-6) What materials are used for drain lines?
22-7) What is the difference between hard and soft copper?
22-8) Why should copper tubing be cut with a tubing cutter instead of a hacksaw?
22-9) How is copper annealed?
22-10) What methods can be used to join soft copper?
22-11) What methods can be used to join hard copper?
22-12) What is the difference between schedule 40 and schedule 80 iron pipe?
22-13) What is the difference between black iron and galvanized iron pipe?
22-14) List the steps for threading iron pipe.
Mount the pipe in a pipe vise.
Cut the pipe to the desired length using the pipe cutter.
Use the pipe reamer to remove the burr left by the pipe cutter.
22-15) What is the difference between PVC and CPVC pipe?
22-16) Why should PVC pipe be cut with a plastic tubing shear instead of a hacksaw?
22-17) What is the difference between type M, L, and K copper tubing?
22-18) What is the difference between ACR copper tubing and tubing for water lines?
22-19) Why are pipe threads tapered?
22-20) What is the difference between nominal size and outside diameter?
22-21) What is the actual inside diameter of schedule 40, ¾ inch black iron pipe?
22-22) How many threads per inch are there on the threaded portion of 1-inch iron
pipe?
22-23) Explain how a compression fitting works.
The compression joint is composed of a compression sleeve, a ferrule, and a
22-24) List the steps for flaring the end of copper tubing.
Clamp the tubing in the flaring block with approximately 1/8 inch above the
22-25) What is the difference between a flare for an R-410A system and an R-22
system?
